Searching library catalogs by keyword, then by exact subject heading, will allow you to locate books which are devoted to, or have a chapter/essay devoted to, analysis of your topic. Footnotes and bibliographies found in these works are rich sources of further research material.

Catalog & WorldCat

Sample exact subject searches:
Constitutional amendments -- United States
Constitutional history -- United States
Constitutional law -- United States
Constitutional conventions -- United States
United States Constitution
United States Constitutional Convention (1787)
United States Constitution 1st Amendment  (or other amendment)
Words that describe the subject of each amendment,
     e.g. Firearms -- Law and legislation
           Searches and seizures -- United States